Hullihg-stone dress



UNITED STATES DATEN T CFFTCE.

JNO. A. WILSON, OF DOVER, NEW JERSEY.

HULLING-STONE DRESS. v

Specification of Letters Patent No. 20,601, dated June 15, 1858.

To all 'whom t may concern.'

Be it known that I, JorrN A. WiLsoN, of Dover, in the county of Morris,in the State of New Jersey, have invented a new and Improved Method ofDressing Millstones for the Purpose of Hulling Rice and all GrainsHaving a Hull or Husk; and I do hereby declare that the following is afull and exact description thereof, reference being had to theaccompanying drawings and to the letters of reference marked thereon.

Figure 1st is a plan of the runner stone inverted. Fig. 2d is a plan ofthe bed stone.

The runner, Fig. lst is 3G inches in diameter and after being dressed toa smooth plain surface perfectly out of wind is laid out -and the cut ordress generated as follows. First, draw two straight lines (A1 and A2)intersecting each other at right angles at the center of the stone.Second, describe a circle of 3 inch radius (B) for eye of stone. Third,describe circle of S inch radius (C). Fourth, draw a straight line (D1)from the intersection of circle B with radius A1 to the intersection ofcircle C with radius A2. Draw 2d, 3d :and 4th in like manner. Fifth,bisect line D1 and describe arc of circle (El). Contract dividers of aninch and describe corresponding circle which will show size and shape offirst discharging furrow. 2d, 3d and 4th are generated and described inlike manner. Sixth, extend dividers 16 inches and place each foot latintersection of radial line A1 with circle C and describe firstretaining furrow (F1) from said intersection to skirt of stone.Contr-act dividers of an inch and describe correspo-nding line whichwill indicate shape and width of retaining furrows. Construct 2d, 3d and4th in like manner.

The bed Fig. 2d is 36 inches in diameter and after being prepared asdescribed in Fig. 1st is laid out as follows. First, draw four straightlines (A1, A2, A3, A4,) intersecting each other in the center atoctangles. Second, describe a circle 2g,- inch radius (B) for eyecircle. Third, describe a circle of 8 inch radius Fourth, describe acircle of l2 inch radius (D). Fifth, draw straight line (El) fromintersection of circle B with radius A1 to intersection of radius A3with circle C. Draw 2d, 3d and 4th in like manner. Sixth, bisect line E1and describe arc of circle (F1), contract dividers inch and describecorresponding circle which will show shape and size of first dischargingfurrow. Construct 2d, 3d and 4th in like manner. Seventh, extenddividers 16 inches and place each foot at intersection of radial line A1with circle C and describe arc of circle (G1) to right hand. Contractdividers of an inch and describe corresponding line which will indicateshape and width of first retaining furrow. Construct 2d, 3d and 4th inlike manner. Eighth, continue dividers 16 inches apart and place onepoint on intersection of line A2 with circle C land describe segment ofcircle (H1) from circle D to skirt of stone. Contract dividers eg of aninch and describe corresponding line for breadth of furrow. Construct2d, 3d and 4th in like manner.

Should the stones used be of greater or less dimensions than 36 inchesdiameter then of course the various circles and arcs of circles must beproportionably increased or reduced.

All furrows must be dressed a. true gage or arc of circle; those inrunner -linch deep and those in bed inch deep.

The two stones run parallel at from -lto inch apart. The grain being fedthrough the eye of the runner is thrown instantly from the center of thestones by the centrifugal force greatly assisted by the 4 dischargingfurrows in the runner and bed until it reaches circle C where it ispartially arrested and retarded by the retaining furrows of runner andbed until it reaches a radius of l2 inches at circle D when it issubjected to an additional similar retarding operation until it is fullyscoured and hulled, in this manner obviating the long known difficultyof hulling stones clogging at the eye and carrying the grain instantlyto the outer part or periphery of the stone and retaining it there wherethe stones have most power of operation and also equalizing thedistribution of the grain over the stones, thereby effectually obviatingall liability of the grain breaking by being overcrowded.

`What I claim las my invention and desire to secure by Letters Patent isThe manner of generating and constructk ing furrows in hulling stonesfor the purpose of equalizing the distribution of the grain over thesurface of the stones so as to prevent clogging at the eye and retainingthe grain on the periphery of the stone until perfectly hulled ias isabove substantially set forth and described.

JOHN A. wiLsoN. [1.. a]

Witnesses:

F. S. FREEMAN, GEO. B. SANFORD.

